Dial Tone Generator (CB5984E)

This circuit is from an old documentation making use of a 3,579,645 MHz analog color television crystal. The audio amplifier supports the equivalent.

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Positive to negative switching power supply (CB8851E)
This circuit was found in Linear Technology documentation from the 90s. The circuit uses the...
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This circuit uses a photo-transistor to trigger a circuit sourcing a square signal for the output. The...